roll: third_party/pigweed 560f88e..4d6a49d (3 commits)

4d6a49d:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/341272 pw_containers: Public StorageBase / StorageBaseFor utility
e5ee473:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/347792 pw_async2: Deregister tasks on destruction; remove PendableAsTask
3be40f8:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/348652 pw_build: New docs landing page

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 560f88ec3e7772..4d6a49d983a195
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8697243381755287201
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I0a397c8a4e7b10a68f5aaf9a73ca51ddfc645185
Reviewed-on: https://pigweed-review.googlesource.com/c/gonk/+/348872
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 560f88e..4d6a49d 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 560f88ec3e77724273e5c5997033ef5ea7bf2d09
+Subproject commit 4d6a49d983a195e72d8c9b4a97c90c7b25d0c04c